# Mathematica 7 compares to other languages

Dotan Cohen dotancohen at gmail.com
Wed Dec 10 22:13:05 CET 2008

```2008/12/10  <w_a_x_man at yahoo.com>:
> On Dec 5, 9:51 am, Xah Lee <xah... at gmail.com> wrote:
>>
>> For those of you who don't know linear algebra but knows coding, this
>> means, we want a function whose input is a list of 3 elements say
>> {x,y,z}, and output is also a list of 3 elements, say {a,b,c}, with
>> the condition that
>>
>> a = x/Sqrt[x^2+y^2+z^2]
>> b = y/Sqrt[x^2+y^2+z^2]
>> c = z/Sqrt[x^2+y^2+z^2]
>
>>
>> In lisp, python, perl, etc, you'll have 10 or so lines. In C or Java,
>> you'll have 50 or hundreds lines.
>
> Ruby:
>
> def norm a
>  s = Math.sqrt(a.map{|x|x*x}.inject{|x,y|x+y})
>  a.map{|x| x/s}
> end

If someone doesn't counter with a Python one-liner then I'm going to
port that to brainfuck.

--
Dotan Cohen

http://what-is-what.com
http://gibberish.co.il

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